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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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Posted: Wed Aug 31, 2011 6:48 pm Post subject:
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I'm using 5 volts just because I'm pretty sure it's standard practice when working with CMOS chips. I imagine the thing will perform a bit more predictably when using 5 volts than if I were using a 9volt battery. I think a 9volt battery will lose it's voltage over time and your circuit at one point in time will be working on 8 volts, then later at 7 volts, then 6, etc. I could be totally wrong though.
The component after R2 in the osc schematic (page 3) is an LED. It will flash when the oscillator swings between 5volts and ground. It is helpful at lower frequencies and also when you are modulating the oscillator at the modulation input. You could remove the LED and the oscillator should work just the same (it may even oscillate at a higher frequency without the LED). |
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Thu Sep 01, 2011 2:32 am Post subject:
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sndbyte wrote: | I'm using 5 volts just because I'm pretty sure it's standard practice when working with CMOS chips. I imagine the thing will perform a bit more predictably when using 5 volts than if I were using a 9volt battery. I think a 9volt battery will lose it's voltage over time and your circuit at one point in time will be working on 8 volts, then later at 7 volts, then 6, etc. I could be totally wrong though. |
Oh ok, thanks, didnt realise that. I didnt have a 7805 as it happens, but a lm317t, but am making an order for some banana jacks now (seems to be the best modular connection), so am grabbing a few 7805s.
sndbyte wrote: | The component after R2 in the osc schematic (page 3) is an LED. It will flash when the oscillator swings between 5volts and ground. It is helpful at lower frequencies and also when you are modulating the oscillator at the modulation input. You could remove the LED and the oscillator should work just the same (it may even oscillate at a higher frequency without the LED). |
Cool, great, my reading of schematics and understanding circuits is getting much better, thanks for your help and detailed notes. This challenege is proving very useful.
BTW, your page 11 is missing, dont know if theres anything on there?
Didnt get much further last night, but learnt a lot, going from breadboard to stripboard is an interesting challenge too, spent a couple of hours getting a layout together, again your notes were helpful. Didnt have the correct switches for the cap switch so again ordered them (expensive hobby!) so will have a go soon.
Thanks
Ben |
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Cynosure
Site Admin
Joined: Dec 11, 2010 Posts: 966 Location: Toronto, Ontario - Canada
Audio files: 82
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Posted: Fri Sep 02, 2011 5:53 am Post subject:
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Paradigm X wrote: | I notice your using 5v rather than 9v, any reasons for this? Im just using a battery at this stage, although i do have a 7805 at home, could use that. |
I think the general rule is to use a power source that is about 3V higher than your regulator. A 9V battery will start at 9V, but will fade to 6V over time. A 5V regulator ensures that your circuit operates the same no matter what voltage is coming out of the battery.
If you want a 9V circuit, then you should be using a 12V supply with a 7809 regulator. |
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Fri Sep 02, 2011 5:58 am Post subject:
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Oh ok, i was just using the battery direct to the circuit, like in the Nic Collins (admittedly rather simple) book.
It works for now but will incorporate a 7805 once they arrive.
Cheers
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Fri Sep 02, 2011 10:07 am Post subject:
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A few minor points:
CMOS will work at up to 15V, but limiting it to 5V will allow mixing 74HC- or even 74LS- if you need to use a function that doesn't exist, or is hard to find, in CD4xxx.
9V battery power will immediately drop to something like 8.4volts as soon as any load is connected. (Something about each cell's internal resistance, IIRC.) Because of this immediate and unavoidable voltage drop, 5V logic could safely be powered by 4 AAs. When it starts acting weird you'd know it's time to replace the batteries.
The Drop Out voltage for 3-terminal regulators is around 2volts, So for a 5Volt regulator, you're good down to 7volts input. _________________ Revenge is a dish best served with a fork... to the eye |
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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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Posted: Fri Sep 23, 2011 8:43 pm Post subject:
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After using all my chips in the grab bag (at least one of each type), I still had some extra panel space. So I added 3 circuits to my case using other CMOS chips I had on hand. Here are the designs below.
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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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Posted: Fri Sep 23, 2011 9:09 pm Post subject:
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And here is the layout of each case. Each wooden case has 4 panels. Panel number 1 starts on the far left. I'll detail each panel and what the input and outputs are in a later post.
The red circles are outputs. The grey circles are inputs. Large circles are pots and there are a few switches that are in a light gray. All the small circles are leds (except the little white circles in the corners... those are screw holes).
I designed these panels in Open Office Draw, printed them and used them as a template for drilling.
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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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Posted: Fri Sep 23, 2011 9:20 pm Post subject:
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Here are my notes for panels 1 to 4 housed in the 1st wooden case.
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sndbyte
Joined: Jun 26, 2009 Posts: 119 Location: sf
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Posted: Fri Sep 23, 2011 9:23 pm Post subject:
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These are the notes for panels 5 to 8 housed in the 2nd wooden case.
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tjookum
Joined: May 25, 2010 Posts: 360 Location: Netherlands
Audio files: 26
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Posted: Sat Sep 24, 2011 4:12 am Post subject:
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you are a machine! Well done, it looks great. _________________ There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die.
Hunter S. Thompson
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adambee7
Joined: Apr 04, 2009 Posts: 420 Location: united kingdom
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Posted: Wed Oct 19, 2011 1:59 am Post subject:
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Thats mighty impressive. thats a decent book's worth. |
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JingleJoe
Joined: Nov 10, 2011 Posts: 878 Location: Lancashire, England
Audio files: 14
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Posted: Sun Nov 13, 2011 11:20 am Post subject:
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sndbyte, you strike me as the kind of person who has a really clean workbench and perhaps a supporting father and a golden retreiver or labrador which fetches your paper in the morning while you drink coffee.
I am envious.
Carry on the good work anyway, I want to hear this device in action. |
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Paradigm X
Joined: Feb 15, 2011 Posts: 363 Location: Null and void
Audio files: 2
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Posted: Mon Nov 14, 2011 5:09 am Post subject:
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It is excellent notekppeing, and very helpful.
Mines kind of been sat to one side recently, need to get back on it
Thanks again sndbyte.
Needs moar audio samples!
Cheers |
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